Most sweater damage can be fixed at home with a needle and thread
A hole, snag, or loose seam in a knitted sweater does not mean the sweater is ruined. Small repairs—patching a hole, securing a pulled thread, reattaching a seam—take 15 minutes to an hour and cost almost nothing. The key is catching damage early. A single loose stitch left alone will unravel into a run that spreads across rows. A small snag pulled tight will tear the yarn. A seam that starts to separate will split wider with each wash.
This guide covers the repairs you can do yourself with basic supplies, and when to hand the sweater to someone with more experience. Most of these techniques work on any knit fabric—cardigans, sweater vests, turtlenecks, and crew necks all repair the same way.
Key Takeaways
- A pulled thread or snag should be gently worked back into place with a crochet hook or needle before it tears the yarn.
- A small hole can be patched from the inside using a needle, thread, and a small piece of matching knit fabric, or darned closed if the hole is very small.
- A loose seam can be re-sewn by hand using a ladder stitch, which is nearly invisible and takes 10 to 15 minutes.
- Pilling (those fuzzy balls on the surface) can be removed with a sweater stone, lint roller, or small scissors, but does not damage the sweater itself.
- Moth holes and large tears usually need professional repair or patching, because the damage is too wide to darn closed neatly.
What you need to repair a sweater at home
You do not need much. A tapestry needle (a blunt needle with a large eye, sold in any craft store) works better than a sharp sewing needle because it slides between knit stitches without splitting the yarn. You will also need thread that matches the sweater's color as closely as possible—if the sweater is wool, use wool thread; if it is cotton, use cotton thread. Mismatched thread shows, especially on light colors.
For pulled threads and snags, a crochet hook (size E or F) helps you work the loose thread back into the knit without making the damage worse. For small holes, you may want a small piece of matching knit fabric to use as a patch—an old sweater in the same color works, or a scrap from a thrift store. A sweater stone (a pumice-like tool sold for removing pilling) is optional but useful if your sweater has developed those fuzzy balls on the surface.
Lay out your supplies before you start. Good lighting matters—you are working with small stitches, and you need to see what you are doing.
How to fix a pulled thread or snag
A pulled thread is a single yarn that has been yanked out of its stitch but is still attached to the sweater. If you leave it, it will unravel. The fix is to work it back into place gently, using a crochet hook or needle to pull the loose thread through the stitches above and below it.
Start by locating where the thread came out. Look at the row of stitches just above the pulled thread and find the loop that should hold it. Insert your crochet hook through that loop from the front, catch the loose thread with the hook, and pull it back through. Move down one row and repeat. Keep going until the thread is worked back into the knit and sits flush with the surface. The sweater should look like nothing happened.
A snag is different—the yarn itself is torn or frayed, not just pulled loose. If the snag is small and the yarn is not broken, you can sometimes work it back in the same way. If the yarn is actually torn, do not pull on it. Instead, use small scissors to trim any loose fibers flush with the surface, then leave it alone. A small trimmed snag will not spread, and it is far less visible than a pulled thread.
How to darn a small hole
Darning is the traditional way to close a small hole—usually one that is smaller than a dime. You use a needle and thread to weave back and forth across the hole, mimicking the knit pattern and pulling the edges together. It takes practice to make it look neat, but the result is strong and nearly invisible if your thread matches well.
Thread your tapestry needle and tie a knot at the end. From the inside of the sweater, push the needle through the edge of the hole, then weave the thread back and forth across the opening in a grid pattern—first horizontally, then vertically, like you are filling in a small square. Pull gently as you go so the edges of the hole draw together. Once the hole is closed, weave the thread through a few stitches on the inside to find it, then trim the excess.
If the hole is very small (smaller than a pencil eraser), you may be able to close it with just a few stitches without a full grid. The goal is to pull the edges together and anchor them so they do not separate again.
How to patch a larger hole
A hole larger than a dime is too big to darn neatly. Instead, patch it from the inside using a small piece of matching knit fabric. The patch should be at least half an inch larger than the hole on all sides.
Cut your patch from a scrap of matching knit fabric. Place it on the inside of the sweater, centered over the hole. Using your tapestry needle and matching thread, sew around the edge of the patch with small stitches, catching both the patch and the sweater. Sew all the way around the perimeter, then sew a second line of stitches about a quarter inch inside the first line for extra strength. From the outside, the hole will be covered by the patch, and the repair will hold through many washes.
If you do not have a matching scrap, check a thrift store for a sweater in the same color and fiber content. You only need a piece a few inches square.
How to re-sew a loose or separating seam
Seams on sweaters are often sewn with a ladder stitch, which is nearly invisible because the thread runs inside the fold of the seam rather than across it. If a seam is coming apart, you can re-sew it using the same stitch.
Turn the sweater inside out and look at the seam. Thread your tapestry needle with matching thread. Starting at one end of the loose section, push the needle through the fold of fabric on one side of the seam, then slide it along inside the fold for about a quarter inch before bringing it back out. Cross to the other side of the seam and repeat—in, along the fold, out. Keep alternating sides, pulling gently every few stitches so the seam draws tight. The thread will be hidden inside the fold, and from the outside the seam will look like it never came apart.
This stitch works on side seams, sleeve seams, and the seam where the ribbing meets the body of the sweater. It takes 10 to 15 minutes for a typical seam, and the repair will last as long as the original seam.
How to remove pilling without damaging the sweater
Pilling is those fuzzy balls that form on the surface of a sweater, usually in areas that rub—under the arms, on the chest, or along the sides. Pilling does not mean the sweater is damaged. It is just loose fibers that have tangled together, and it can be removed without harming the knit underneath.
A sweater stone is the easiest tool. Gently rub it over the pilled area in one direction, using light pressure. The stone will catch the pills and pull them away. You can also use a lint roller or even a fine-tooth comb, though these are slower. If you use scissors, be very careful—snip only the pills themselves, not the sweater fibers. Hold the fabric flat and trim the pills flush with the surface.
After you remove the pills, the sweater may look a little thin in that spot, but the fibers are still there. Pilling usually comes back after a few washes, so you may need to repeat this process every few months.
When to take a sweater to a professional
Some damage is beyond a home repair. Moth holes—small, clean holes scattered across the sweater—usually indicate an infestation, and the sweater may have damage in places you cannot see. A professional cleaner can treat the sweater and assess the full extent of the damage. Large tears, especially in the body of the sweater where the stress is greatest, may need a patch that is stronger than a straightforward hand-sewn one. Damage to ribbing (the cuffs and hem) is tricky because the ribbing is stretchy and a poor repair will pucker or pull.
If a seam has separated over a long section, or if multiple seams are coming apart, the sweater may have a structural problem—perhaps it was washed in water that was too hot, or it was stored wet. A professional can assess whether the sweater is worth repairing or whether the damage is too widespread.
A good dry cleaner or a tailor who specializes in knitwear can usually repair these problems, though the cost may be $30 to $75 depending on the damage. For a sweater you love, it is often worth it.
Frequently Asked Questions
Can I use regular sewing thread to repair a knitted sweater?
Regular sewing thread is thinner than knit yarn and will not match the weight or texture of the sweater. Use thread made from the same fiber as the sweater—wool thread for wool sweaters, cotton for cotton. If you cannot find an exact match, choose a thread that is slightly darker rather than lighter, because it will be less visible.
What should I do if a sweater starts to unravel from a hole?
Stop the unraveling when ready by tying a knot in the loose thread or securing it with a small stitch. Do not pull on the thread. Once you have stopped the spread, you can repair the hole itself using the darning or patching method described above. The sooner you catch it, the smaller the repair will be.
How do I prevent holes and snags in the first place?
Store sweaters folded flat rather than on hangers, which can stretch them out of shape. Keep them away from rough surfaces, hooks, and velcro. Wash them gently in cool water and lay them flat to dry. Pilling is normal and does not mean the sweater is low quality—even expensive wool sweaters pill. Remove pills regularly so they do not felt into the fabric.
Can I repair a sweater that has shrunk in the wash?
Shrinkage is not a tear or hole, so it is not a repair in the traditional sense. A sweater that has shrunk slightly may relax a little if you soak it in cool water with a bit of hair conditioner, then gently stretch it back to shape while it dries flat. If it has shrunk a lot, the fibers have permanently contracted and there is no way to restore the original size.